The FreeMax 904L M Mesh Replacement Coils offers a wide range of atomizer cores, they are compatible with the Freemax M Pro 2, the Freemax Mesh Pro, M Pro 3 Sub Ohm Tank and the Freemax Maxus 200W kit. They utilize the latest FM COILTECH 4.0 - upgraded coil tech. - a new metal material (SS904L) using a Tea Fiber Cotton that leads to a new level of excellence. Find true flavour with these new SS904L coils.